Add evidence-near semantic architecture experiments

Record the V1-V3 experiments and accept the minimal semantic-preservation first stage.

tests/gold/topic_reconstruction_v2/README.md

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+# topic_reconstruction_v2
+
+Focused experimental Gold material derived from BUG-015 and the Progeo
+discussion. These cases evaluate topic-oriented reconstruction rather than
+exact protocol wording or flat category extraction.
+
+The nine cases cover:
+
+- an idea mentioned without further development;
+- multiple alternatives;
+- an unaccepted proposal;
+- a proposal with an objection;
+- an explicitly rejected alternative;
+- acceptance limited to a bounded trial;
+- discussion ending without a decision;
+- a resulting Action Item;
+- an outcome accompanied by an unresolved issue.
+
+Evidence units carry stable local IDs. Expected criteria describe semantic
+features and prohibited promotions rather than exact generated sentences.